From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2008-07-07 11:15:15
On Mon, Jul 7, 2008 at 6:16 AM, William Levak <email@example.com> wrote: > On Thu, 3 Jul 2008, Ruud@baltissen.org wrote: > >> Hallo allemaal, >> >> I have two of these boxes. One with a sticker saying "Diagnostic clip >> series 3000", containing a 2532. Its contents: >> http://www.baltissen.org/files/diag3000.bin > > This file contains the same contents twice. Your EPROM is a 2516 not a > 2532. It is also the same as my diagnostic EPROM for the non-6545 PET's. ISTR a mention of a 2516 (2316?) in the scan of the instructions for the oldest version of the clip (pre-6545). Perhaps they changed to a 2532 later when that's what they had lying around. The contents of Ruud's download are, of course 2K of code, duplicated. I have taken a preliminary pass at it with a disassembler. but no more than a glance. It appears that to make "printing" easy, they emit strings right to screen memory at pre-calculated fixed X, Y positions - not even a "print" subroutine in the ROM. > I have transferred my diagnostic EPROM files to my pc. There are 3: > > non-6545 PET's - 2K > 40 column 6545 PET's - 4K > 80 column 6545 PET's - 4K Nice. I don't have a CTRC PET with me, but I have more than a few at home. > My diagnostic device for the 6545 PET's has a switch that selects between 40 > or 80 columns, and contains both the 6545 EPROM's. I believe there was an > older version of this device that had only the 40 column EPROM, and no > switch. I may have a 40-col--CTRC-only diagnostic clip at home, but I'm not sure. I can't check it for months. > I have some instructions that go with these, that I need to transcribe, and > then I will upload the package to zimmers.net. Thank you for that. I don't mind drawing up schematics of the innards with something like EagleCAD, but I don't have a wiring diagram. Is that something that you might be able to provide as well? The docs I just read mentioned one chip inside besides the ROM, so it shouldn't be too complicated to describe. -ethan Message was sent through the cbm-hackers mailing list
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